i saw a d2000 in your profile... not an open-back but how is its bass vs. pro 2900? both quantity and quality.
does the pro 2900 still hit decently hard for a bass-head?
It's hard to compare them. First, my Denon is modded, so that might affect the bass in ways i'm not sure of.
Second, Denon's are known to focus on sub bass, while ultrasone's tend to be more about mid-bass.
These factors make it hard to compare them. Overall, I like the quality of the bass on the 2900 more, it does hit hard enough for me. I do think, though, that the Denon has more quantity because it is closed. That's just kind of a tradeoff with open vs closed. Better soundstage, but closed can give a little more bass quantity.
If amped OR unamped, the resolution and detail retrieval of the 2900 is superior to the 2000 without question. I'm a bass-head, all the headphones I've liked are bass heavy, and I still love the 2900. Again, it's not as bassy as 900 (where the bass is the total focus) , but it deff has great deep bass and it sounds wonderful. The 2900 bass just blends in with the mix more, while with the 900 it's like "look at me, look at me!!!!" The 2900 has bass that pounds when it needs to, and doesn't when it shouldn't. They are NOT at all bass shy.
From someone who has owned all three, I'd again suggest the 2900. If I could have only one, with no hesitation I'd say 2900. I'm reaching for it more than the others. Unbelievable resolution (main advantage to me), great open sound, great bass, fun and impressive sound to show off to friends.
The one complaint I can certainly see someone having here is with the highs, it can be fatiguing on certain tracks, it extends all the way up there... But that's the reason they have the crazy clarity that they have.
If you do end up going for the 2900, don't judge right away. It needs to be burned 100-200 hours before you listen.
When I switch from 2900 to 900, it can feel like the 900 has too much (read overwhelming) bass. It just doesn't always sound right, but sometimes sounds awesome.